Sidney–Richland Municipal Airport is a public use airport located one nautical mile (2 km) west of the central business district of Sidney, a city in Richland County, Montana, United States. It is owned by the Sidney Richland Airport Authority. The airport is served by one commercial airline, service is subsidized by the federal government's Essential Air Service program at a cost of $3,777,579 (per year).As per Federal Aviation Administration records, the airport had 13,385 passenger boardings (enplanements) in calendar year 2008, As per the Federal Aviation Administration, this airport had 2,031 passenger boardings (enplanements) in calendar year 2008, 2,766 in 2009, and 3,659 in 2010. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation airport based on enplanements in 2008 (the commercial service category requires at least 2,500 enplanements per year).Scheduled air service temporarily ceased on March 8, 2008, when Big Sky Airlines ended operations in bankruptcy. Great Lakes Airlines was given USDOT approval to take over Essential Air Service (EAS) and flights began in 2009. Between 2011 and 2013, service was provided under EAS contract by Silver Airways (formerly Gulfstream International Airlines). Effective December 10, 2013 service between Sidney and Billings is provided five times per day by Cape Air in Cessna 402C equipment.
